package com.discuss.community.controller;

import com.discuss.community.util.CommunityUtil;
import com.discuss.community.util.RedisKeyUtil;
import com.google.code.kaptcha.impl.DefaultKaptcha;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

/*验证码*/
@RestController
@Slf4j
public class CaptchaController {

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private DefaultKaptcha defaultKaptcha;
    @Autowired
    private RedisTemplate redisTemplate;

    @ApiOperation(value="验证码")
    @GetMapping(value = "/captcha",produces = "image/jpeg")
    public void captcha(HttpServletRequest request, HttpServletResponse response){
        // 定义response输出类型为image/jpeg类型
        response.setDateHeader("Expires", 0);
        // Set standard HTTP/1.1 no-cache headers.
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        // Set standard HTTP/1.0 no-cache header.
        response.setHeader("Pragma", "no-cache");
        // return a jpeg
        response.setContentType("image/jpeg");
        //-------------------生成验证码 begin --------------------------
        //获取验证码文本内容
        String text = defaultKaptcha.createText();
        log.info("验证码：===> {}" , text);
        //将验证码文本内容放入session
        //request.getSession().setAttribute("captcha",text);

        // 验证码的归属
        String captchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("captchaOwner", captchaOwner);
        cookie.setMaxAge(60);
        cookie.setPath(contextPath);
        response.addCookie(cookie);
        // 将验证码存入Redis
        String redisKey = RedisKeyUtil.getCaptchaKey(captchaOwner);
        redisTemplate.opsForValue().set(redisKey, text, 60, TimeUnit.SECONDS);


        //根据文本验证码内容创建图形验证码
        BufferedImage image = defaultKaptcha.createImage(text);
        ServletOutputStream outputStream = null;
        try {
            outputStream = response.getOutputStream();
            //输出流输出图片，格式为jpg
            ImageIO.write(image,"jpg",outputStream);
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                assert outputStream != null;
                outputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        //-------------------生成验证码 end --------------------------

    }
}
